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- W3102297834 abstract "A non-singular bouncing cosmology is generically obtained in loop quantum cosmology due to non-perturbative quantum gravity effects. A similar picture can be achieved in standard general relativity in the presence of a scalar field with a non-standard kinetic term such that at high energy densities the field evolves into a ghost condensate and causes a non-singular bounce. During the bouncing phase, the perturbations can be stabilized by introducing a Horndeski operator. Taking the matter content to be a dust field and an ekpyrotic scalar field, we compare the dynamics in loop quantum cosmology and in a non-singular bouncing effective field model with a non-standard kinetic term at both the background and perturbative levels. We find that these two settings share many important properties, including the result that they both generate scale-invariant scalar perturbations. This shows that some quantum gravity effects of the very early universe may be mimicked by effective field models." @default.
- W3102297834 created "2020-11-23" @default.
- W3102297834 creator A5008108309 @default.
- W3102297834 creator A5079963457 @default.
- W3102297834 date "2014-03-14" @default.
- W3102297834 modified "2023-10-11" @default.
- W3102297834 title "Non-singular bounce scenarios in loop quantum cosmology and the effective field description" @default.
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- W3102297834 doi "https://doi.org/10.1088/1475-7516/2014/03/026" @default.
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